public class People
{

  private String name;
  private String age;
  private String address;

  public People(final String name, final String age, final String address)
  {
    this.name = name;
    this.age = age;
    this.address = address;
  }

  public boolean isAttributeEqual(final People dupPeop)
  {
    return this.address.equals(dupPeop.address) && this.age.equals(dupPeop.age) && this.name.equals(dupPeop.name);
  }

  public static void main(final String[] args)
  {

    List<People> asList = Arrays.asList(new People("Sri", "28", "TN"), new People("Sri", "28", "TN"), new People("Sri", "28", "TN"),
        new People("Pri", "28", "TN"));

    List<People> groupSimilar = groupSimilar(asList);

  }

  public static List<People> groupSimilar(final List<People> people)
  {
    List<People> duplicatePeople = new ArrayList<>(people);
    for (Iterator<People> iterator = duplicatePeople.iterator(); iterator.hasNext();)
    {
      People people2 = iterator.next();
      for (People orignalPeople : people)
      {
        if (!orignalPeople.equals(people2) && orignalPeople.isAttributeEqual(people2))
        {
          iterator.remove();
          people2 = iterator.next();
        }
      }
    }
    return duplicatePeople;
  }
}

public class People

private String name;
private String age;
private String address;

public boolean isAttributeEqual(final People dupPeop)

List<People> asList = Arrays.asList(new People("Sri", "28", "TN"), new People("Sri", "28", "TN"), new People("Sri", "28", "TN"),
    new People("Pri", "28", "TN"));

List<People> groupSimilar = groupSimilar(asList);

List<Person> persons

List<Person> people

List<Person> similarPeople = groupSimilar(people);

List<Person> similarlyGroupedPeople = groupSimilar(people);

public static List<People> groupSimilar(final List<People> people)
  {
    List<People> duplicatePeople = new ArrayList<>(people);
    for (Iterator<People> iterator = duplicatePeople.iterator(); iterator.hasNext();)
    {
      People people2 = iterator.next();
      for (People orignalPeople : people)
      {
        if (!orignalPeople.equals(people2) && orignalPeople.isAttributeEqual(people2))
        {
          iterator.remove();
          people2 = iterator.next();
        }
      }
    }
    return duplicatePeople;
  }